The Samuel Clark/CJ series is by Cindy Leuch, and Jonathan is the older brother. Veronica calls Clark "Clarkey" in WIEAK, and Lois repeats it in disgust. But I also seem to remember Lois saying it sometime later in a baby doll voice to tease Clark, but I can't remember when. Maybe she just says, "Oh, Cla-ark," making two syllables of his name and that's what I'm remembering.
